public async Task <object> Get(AsyncExprCtx ae)
{
var s = sema;
if (s != null)
{
if (s == errFlag)
{
throw (Exception)value;
}
await s.WaitAsync(ae.Cancellation);
try
{
if (sema != null)
{ // enter here only once
if (sema == errFlag)
{
throw (Exception)value;
}
try
{
value = await OPs.VectorValueOf(ae, value);
sema = null;
}
catch (OperationCanceledException) { throw; }
catch (Exception ex)
{
value = ex;
var tmp = sema; sema = errFlag; //tmp.Dispose();
throw;
}
}
}
finally { s.Release(); }
}
return(value);
}
